CN116973347B - Excitation measurement device based on SLIPI-3DLIF and application - Google Patents
Excitation measurement device based on SLIPI-3DLIF and application Download PDFInfo
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- 238000001499 laser induced fluorescence spectroscopy Methods 0.000 description 3
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6402—Atomic fluorescence; Laser induced fluorescence
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
Abstract
An excitation measurement device based on SLIPI-3DLIF and application thereof relate to a laser excitation measurement device and application thereof. The single laser system excites wavelength meeting the requirement, the structural light shaping modulation system shapes and modulates the sheet structural laser, the distributed reflecting mirror group comprises a plurality of reflecting mirror groups arranged around the flow field to be detected, the sheet structural laser is subjected to multiple-time cross excitation on the flow field to be detected by a plurality of sheet light planes from different angles, and the detection system acquires fluorescent projection images of the flow field to be detected excited by the plurality of sheet light planes multiple times. The transmission direction of the single-beam sheet-shaped structure laser is changed by using the distributed reflector group, so that the single-beam sheet-shaped structure laser excites the flow field to be measured for multiple times in different parallel planes and different angles, and the problem that the laser energy is too low due to light splitting of a single laser system and a structural light shaping modulation system is solved.
Description
Technical Field
The invention relates to a laser excitation measuring device and application, in particular to an excitation measuring device and application based on SLIPI-3DLIF, and belongs to the technical field of laser spectrum application.
Background
The Three-dimensional laser induced fluorescence (Three-dimensional Laser Induced Fluorescence based on Structured Laser Illumination Planar Imaging, SLIPI-3 DLIF) based on structured light illumination is used as a novel laser spectrum technology, is mainly applied to Three-dimensional visualization of a flow field, and can be used for realizing high-speed Three-dimensional measurement of a complex flow field due to the advantages of non-invasiveness, high space-time resolution, instantaneous measurement and the like.
Implementations of 3DLIF technology are divided into multi-plane scanning, multi-view tomography and structured light illumination. The multi-plane scanning type laser imaging device comprises a laser, a scanning vibration mirror, a scanning device, a scanning imaging device and a scanning imaging device, wherein the multi-plane scanning type laser is formed into sheet light by shaping the laser and scanning excitation is realized by using the scanning vibration mirror or other scanning devices, and belongs to non-transient measurement, and the requirements of high-dynamic flow field freezing imaging cannot be met; the multi-view tomography realizes three-dimensional measurement by adopting a body beam for excitation, a multi-camera or multi-beam splitting optical fiber to acquire images at multiple views, has high requirements on high-energy laser development technology, has higher cost and has large error of a three-dimensional reconstruction algorithm; the three-dimensional laser induced fluorescence (SLIPI-3 DLIF) based on the structure light illumination integrates the advantages of the two modes, laser is modulated into sheet laser with space cosine distribution through a space modulation technology, multiple sheets of light with the same modulation frequency are incident into a flow field to be measured in different parallel planes and at different angles, then a camera is utilized to collect fluorescent images of overlapping parts perpendicular to the sheet light direction, the collected images contain information of overlapping of the multiple sheets of light excited fluorescent light, the information of the different sheets of light excited fluorescent light has different structure information, therefore, multiple exposure frequency identification algorithm (FRAME) is needed to demodulate the images, then PLIF images with multiple planes can be separated from one PLIF image, and then three-dimensional reconstruction methods such as plane interpolation or deep learning are adopted to reconstruct a three-dimensional image of the flow field, so that three-dimensional measurement is realized, transient measurement can be realized, measurement cost is effectively controlled, a measurement system is simplified, and the three-dimensional visualization development potential of the high dynamic complex flow field is realized.
For a general scale flow field, at least four or more sheet structure lasers are required to be excited in different parallel planes and at different angles for SLIPI-3DLIF measurement, so that multiple sheet structure lasers are required to be output, and at present, two main types of multiple sheet structure laser implementation modes exist: one is to adopt a plurality of laser systems to respectively carry out structural light shaping modulation on laser, however, the method has huge cost, and the difference of laser beam distribution output by different lasers and shaping modulation systems can cause measurement errors, so the method is not generally adopted; the other is to use a single set of laser system, and then to use a spectroscope to split light for multiple times after the structural light is shaped and modulated to realize the output of a plurality of sheet-shaped structural lasers, however, when the laser is modulated, the energy loss is nearly 80% after passing through a Langerhans grating, a double slit and various lenses, and the laser energy density of each sheet-shaped structural laser is very low after the light is split, so that the excitation threshold of the tracer is difficult to reach in most scenes, which is also the biggest reason for preventing the wide application of SLIPI-3DLIF measurement.
According to the current reflector coating technology level, the reflectivity of the reflector can reach more than 99%, if a single laser system and a structural light shaping modulation system are abandoned and a reflection scheme is adopted, namely, a distributed reflector group with a preset position and angle is placed in a ring flow field to be detected, the reflection of each reflector is utilized to enable a single-beam flaky structure laser to pass through the flow field to be detected in different parallel planes and different angles and excite a tracer, and the time delay caused by the reflection of an optical path is negligible compared with the detector door width (the fluorescent detection door width is generally more than or equal to 50 ns), so that the problem that the laser energy is too low due to the light splitting of the single laser system and the structural light shaping modulation system can be solved, high energy excitation is further realized, and the signal to noise ratio and the measurement accuracy of images are further improved.
Disclosure of Invention
In order to solve the defects in the background technology, the invention provides an excitation measuring device based on SLIPI-3DLIF and application thereof, which utilizes a distributed reflector group to change the transmission direction of single-beam sheet-shaped structure laser so as to excite a flow field to be measured for multiple times in different parallel planes and different angles, thereby solving the problem of low laser energy caused by light splitting of a single laser system and a structural light shaping modulation system.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an excitation measurement device based on SLIPI-3DLIF comprises a single laser system, a structural light shaping modulation system, a distributed reflector group and a detection system;
the single laser system excites the wavelength meeting the requirement according to the tracer of the flow field to be detected through a laser;
the structure light shaping modulation system comprises beam expanding lenses, collimating lenses and focusing lens groups which are sequentially arranged at intervals from the near end to the far end of the laser, wherein the focusing lens groups comprise three focusing lenses, a Langerhans grating is arranged between two focusing lenses adjacent to the laser direction, a double slit is arranged between two focusing lenses far away from the laser direction, and circular light beams emitted by the laser are shaped and modulated into sheet-shaped structure lasers with space intensity cosine distribution according to an excitation area of fluid to be detected;
the distributed reflector group comprises a plurality of sets of reflector groups arranged around a flow field to be detected, the number of the reflector groups is determined according to the set excitation times, the set excitation times are m, the number of the reflector groups is n, then n=m-1, each set of reflector groups comprises two plane conversion reflectors and two angle correction reflectors, the two plane conversion reflectors are distributed in a splayed transverse symmetrical mode to convert a sheet light plane into two different parallel planes, the two angle correction reflectors are positioned in the same sheet light plane to conduct angle correction, the converted sheet light plane is guided to the next set of reflector groups, and the sheet-shaped structural laser obtained through the structural light shaping modulation system is subjected to multiple cross excitation of the flow field to be detected through the distributed reflector groups at different angles;
the detection system adopts a camera and is provided with an image intensifier, a lens and an optical filter, and the lens of the camera is perpendicular to the light plane and is aligned to the overlapping area on the space of a plurality of light planes, so that fluorescent projection images of the flow field to be detected are acquired by a plurality of light planes excited for a plurality of times.
An application of an excitation measurement device based on a SLIPI-3DLIF, comprising the steps of:
step one: outputting laser with target wavelength by using a laser of a single laser system, introducing a structural light shaping modulation system, and shaping and modulating the laser into sheet-shaped structural laser with spatial intensity cosine distribution;
step two: determining the number of reflector groups in the distributed reflector group according to the set excitation times and arranging the reflector groups around a flow field to be detected;
step three: the laser with the shaped and modulated sheet structure is incident into the distributed reflector group, plane conversion and angle correction are carried out, and finally, overlapping areas in the axial direction of the flow field to be tested are excited in multiple times by multiple sheet light planes from different angles;
step four: arranging the detection system perpendicular to the sheet light planes, enabling the view field to cover the overlapped areas of all the sheet light planes, collecting fluorescent images, and reconstructing a three-dimensional structure of the excitation area of the flow field to be detected by adopting a multiple exposure frequency identification algorithm and a three-dimensional reconstruction method.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention adopts a single laser system and a structural light shaping modulation system, and solves the problems of huge cost, large measurement error and complex system of a plurality of laser systems and structural light shaping modulation systems;
2. the invention adopts a scheme of multiple reflection to replace a scheme of multiple light splitting, solves the problem of low energy density caused by light splitting of the existing single-set laser system, and can realize high-energy excitation and high signal-to-noise ratio measurement;
3. the invention provides a design of parallel plane conversion and angle correction of the laser of the sheet structure, and can realize measurement of different parallel planes and different angles according to requirements by only changing the number, the angles and the positions of the reflecting mirror groups, thereby having high flexibility.
Drawings
FIG. 1 is a schematic diagram of a single set of laser systems and a structured light shaping modulation system employed in the present invention;
FIG. 2 is a three-dimensional illustration of the optical path within a distributed mirror array employed in the present invention;
FIG. 3 is a front view of FIG. 2, with the detection system not shown for ease of viewing;
FIG. 4 is a top view of FIG. 2, with the excitation region not shown for ease of viewing;
fig. 5 is a left side view of fig. 2, with the excitation area not shown for ease of viewing.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present invention are all within the protection scope of the present invention.
As shown in fig. 1-2, an excitation measurement device based on a SLIPI-3DLIF comprises a single set of laser system, a structured light shaping modulation system, a distributed mirror group and a detection system.
The single laser system excites the wavelength meeting the requirement according to the tracer of the flow field to be detected through a laser;
the structure light shaping modulation system comprises beam expanding lenses, collimating lenses and focusing lens groups which are sequentially arranged at intervals from the near end to the far end of the laser, wherein the focusing lens groups are three focusing lenses, a Langmuir grating is arranged between two focusing lenses adjacent to the laser direction, a double slit is arranged between two focusing lenses far away from the laser direction, and circular light beams emitted by the laser are shaped and modulated into sheet-shaped structure lasers with space intensity cosine distribution according to an excitation area of fluid to be detected;
the distributed mirror group comprises a plurality of mirror groups arranged around a flow field to be detected, an example diagram is combined with the diagram shown in fig. 2, the number of the mirror groups is determined according to the set excitation times, the set excitation times (the same as the number of the sheet light planes) are m, the number of the mirror groups is n, n=m-1, each mirror group comprises two plane conversion mirrors and two angle correction mirrors, the two plane conversion mirrors are distributed in a splayed transverse symmetrical mode to convert the sheet light planes into two different parallel planes, the two angle correction mirrors are positioned in the same sheet light plane to conduct angle correction, the converted sheet light planes are guided to the next set of mirror groups, the sheet structure laser obtained through the structural light shaping modulation system is subjected to multiple cross excitation on the flow field to be detected through a plurality of sheet light planes at different angles, each mirror reflection surface is plated with a high reflection film, the reflectivity is selected according to the laser wavelength, the number and the positions of the mirrors are combined with the set excitation times and the sheet light planes to be separated, the length and the width of the mirrors are combined, the length and the width of the mirrors are determined according to the laser light leakage angles of the sheet structure laser light, and the whole incidence angle is ensured, and the whole incidence angle of the sheet structure laser light is ensured to be different from the laser light incidence angle;
the detection system adopts a camera and is provided with an image intensifier, a lens and an optical filter, and the lens of the camera is perpendicular to the light plane and is aligned to the overlapping area on the space of a plurality of light planes, so that fluorescent projection images of the flow field to be detected are acquired by a plurality of light planes excited for a plurality of times.
As shown in fig. 1-2, an application of an excitation measurement device based on sli-3 DLIF comprises the steps of:
step one: outputting laser with target wavelength by using a laser of a single laser system, introducing a structural light shaping modulation system, and shaping and modulating the laser into sheet-shaped structural laser with spatial intensity cosine distribution;
step two: determining the number of reflector groups in the distributed reflector group according to the set excitation times and arranging the reflector groups around a flow field to be detected;
step three: the laser with the shaped and modulated sheet structure is incident into the distributed reflector group, plane conversion and angle correction are carried out, and finally, overlapping areas in the axial direction of the flow field to be tested are excited in multiple times by multiple sheet light planes from different angles;
step four: arranging the detection system perpendicular to the sheet light planes, enabling the view field to cover the overlapped areas of all the sheet light planes, collecting fluorescent images, and reconstructing a three-dimensional structure of the excitation area of the flow field to be detected by adopting a multiple exposure frequency identification algorithm and a three-dimensional reconstruction method.
The invention realizes the high-energy excitation measurement of the SLIPI-3DLIF of a single laser system by designing the distributed reflector group to reflect a beam of laser with a shaped and modulated sheet structure to excite the laser from different parallel planes and different angles.
Examples
The embodiment takes four-sheet light plane cross excitation as an example to determine the arrangement mode of a distributed reflector group, and is combined with the illustration of fig. 2-5, and the distributed reflector group comprises three sets of reflector groups, namely reflectors 1-4, reflectors 5-8 and reflectors 9-12, wherein the reflectors 1-2, 5-6 and 9-10 are plane conversion reflectors, the reflectors 3-4, 7-8 and 11-12 are angle correction reflectors, arrows show the light path transmission direction, and sheet-structured laser respectively passes through the excitation areas of a flow field to be measured from four angles in four times of cross excitation under the reflection of the distributed reflector group after incidence of the sheet-structured laser.
First, shaping and modulation of laser light are performed. According to the absorption wavelength of a flow field tracer to be detected, the output wavelength of a laser is selected, a single set of laser system outputs laser to a structural light shaping modulation system, the laser is expanded into sheet-shaped beams through a cylindrical beam expander, a cylindrical collimating mirror and a cylindrical focusing mirror in sequence, then the laser is diffracted through a Langerhans grating (the duty ratio is 1:1, the number of the dividing lines is determined according to the space resolution requirement), then the laser is converged through a cylindrical focusing mirror (convex lens), so that diffraction light of different orders is generated at a focal length, double slits are arranged at the focal length, the double slits retain-1 and +1-order diffraction light, the other-order diffraction light is blocked, the-1 and +1-order diffraction light is interfered, and finally the sheet-shaped parallel structural laser is generated through collimation through the cylindrical focusing mirror (convex lens).
Secondly, multi-plane and multi-angle excitation of the laser with the shape structure is carried out. The modulated laser with the lamellar structure is incident to a flow field to be measured at 135 degrees along a Z1 plane, so that the first lamellar light plane (Z1 plane) excitation of the flow field to be measured is realized; the central line of the short side of the reflector 1 is superposed with the Z1 plane, the reflecting surface of the reflector is 45 degrees with the Z1 plane and the XOZ plane, the central line of the short side of the reflector 2 is superposed with the Z2 plane, the reflecting surface of the reflector is vertical to the reflecting surface of the reflector 1, and the laser Z1 plane with a sheet structure enters the Z2 plane through the reflection of the reflector 1 and the reflector 2 after being excited, so that the conversion from the Z1 plane to the Z2 plane is realized; then, the central line of the short side of the reflecting mirror 3 is superposed with the Z2 plane, the reflecting surface of the reflecting mirror is vertical to the Z2 plane and the XOZ plane, the central line of the short side of the reflecting mirror 4 is superposed with the Z2 plane, the reflecting surface of the reflecting mirror is vertical to the Z2 plane and forms an angle of 67.5 DEG with the XOZ plane, and after entering the Z2 plane, the sheet-shaped structure laser is reflected by the reflecting mirror 3 and the reflecting mirror 4, the angle of the sheet-shaped structure laser is changed into 270 DEG, so that the angle correction of the Z2 plane of the sheet-shaped structure laser is realized; the angle-corrected lamellar structure laser is incident to the flow field to be measured at 270 degrees along the Z2 plane, so that the second lamellar light plane (Z2 plane) excitation of the flow field to be measured is realized; the reflectors 1-4 are used as a set of reflector groups, the conversion from the Z1 plane to the Z2 plane and the angle correction from 135 degrees to 270 degrees of the sheet-shaped structural laser are realized through the steps, the two subsequent sets of reflector groups are arranged according to the same concept, and finally the sheet-shaped structural laser sequentially excites the flow field to be measured along four parallel planes (Z1, Z2, Z3 and Z4) and four different angles (135 degrees, 270 degrees, 45 degrees and 180 degrees) for four times so as to meet the requirement of measuring multiple planes and multi-angle excitation by SLIPI-3 DLIF.
And finally, image acquisition, demodulation and three-dimensional reconstruction are carried out. And (3) constructing a detection system, wherein the lens is vertical to the Z plane, and the field of view covers the area where the sheet-shaped structure laser excites the flow field to be detected four times along the Z direction, and the area is an excitation area. Under the general condition, the detector gate width required by fluorescence acquisition is more than or equal to 50ns, and the time scale is far greater than the time delay of light path reflection, so that the image acquired by single exposure is a superimposed image of PLIF signals generated by sequentially exciting a flow field plane to be detected by sheet light four times by adjusting the time delay of the detector, and the PLIF signals excited by different planes have different spatial angle structures. The collected images are demodulated using a multiple exposure frequency identification algorithm (FRAME) to separate four planar PLIF images from one PLIF image. And carrying out three-dimensional reconstruction (a plane interpolation algorithm or a machine learning method) on the four PLIF images according to the actual space positions of the four planes to obtain a three-dimensional structure of the excitation area, thereby realizing 3DLIF measurement.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (3)
1. An excitation measurement device based on SLIPI-3DLIF, characterized in that: the system comprises a single laser system, a structural light shaping modulation system, a distributed reflector group and a detection system;
the single laser system excites the wavelength meeting the requirement according to the tracer of the flow field to be detected through a laser;
the structure light shaping modulation system comprises beam expanding lenses, collimating lenses and focusing lens groups which are sequentially arranged at intervals from the near end to the far end of the laser, wherein the focusing lens groups comprise three focusing lenses, a Langerhans grating is arranged between two focusing lenses adjacent to the laser direction, a double slit is arranged between two focusing lenses far away from the laser direction, and circular light beams emitted by the laser are shaped and modulated into sheet-shaped structure lasers with space intensity cosine distribution according to an excitation area of fluid to be detected;
the distributed reflector group comprises a plurality of sets of reflector groups arranged around a flow field to be detected, the number of the reflector groups is determined according to the set excitation times, the set excitation times are m, the number of the reflector groups is n, then n=m-1, each set of reflector groups comprises two plane conversion reflectors and two angle correction reflectors, the two plane conversion reflectors are distributed in a splayed transverse symmetrical mode to convert a sheet light plane into two different parallel planes, the two angle correction reflectors are positioned in the same sheet light plane to conduct angle correction, the converted sheet light plane is guided to the next set of reflector groups, and the sheet-shaped structural laser obtained through the structural light shaping modulation system is subjected to multiple cross excitation of the flow field to be detected through the distributed reflector groups at different angles;
the detection system adopts a camera and is provided with an image intensifier, a lens and an optical filter, and the lens of the camera is perpendicular to the light plane and is aligned to the overlapping area on the space of a plurality of light planes, so that fluorescent projection images of the flow field to be detected are acquired by a plurality of light planes excited for a plurality of times.
2. The excitation measurement device according to claim 1, wherein: the reflecting surfaces of the plane conversion reflecting mirror and the angle correction reflecting mirror of the reflecting mirror group are plated with high reflecting films.
3. An application of an excitation measurement device based on SLIPI-3DLIF, which is characterized in that: excitation measurement device according to claim 1, the application of which comprises the steps of:
step one: outputting laser with target wavelength by using a laser of a single laser system, introducing a structural light shaping modulation system, and shaping and modulating the laser into sheet-shaped structural laser with spatial intensity cosine distribution;
step two: determining the number of reflector groups in the distributed reflector group according to the set excitation times and arranging the reflector groups around a flow field to be detected;
step three: the laser with the shaped and modulated sheet structure is incident into the distributed reflector group, plane conversion and angle correction are carried out, and finally, overlapping areas in the axial direction of the flow field to be tested are excited in multiple times by multiple sheet light planes from different angles;
step four: arranging the detection system perpendicular to the sheet light planes, enabling the view field to cover the overlapped areas of all the sheet light planes, collecting fluorescent images, and reconstructing a three-dimensional structure of the excitation area of the flow field to be detected by adopting a multiple exposure frequency identification algorithm and a three-dimensional reconstruction method.
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